are the 4.6 cranks and rods the same from the gems engines to the bosch engines, I cant find any P38 4.6 short blocks.
4.6 Crankshaft and rods interchange
- Thread starter no694terry
- Start date
And if I swap out my 4.0 crank and rods for 4.6, will that cause a problem that the pistons will be dropping down lower in the cylinders than it has in 116k previous miles.
Crank and rods are only one step in this set-up. Doing only the crank and rods is a waste of time.
well i would get a new cam like a crower or something, and new other stuff. i'm just trying to get all the parts together and the crank and rods seems to be the hardest to find right now. If i pull my motor to rebuild it like it seems i have to do, i'm not putting a regular 4.0 back in it.
I find this hard to believe. You're the cheapfuck who buys $28.00 fuel pumps, but you're going to spend several grand ($3k to $5k) building a stroker to install in your truck?
You seem like a $500.00 3.9L kind of guy to me.
You seem like a $500.00 3.9L kind of guy to me.
where you get 3-5 grand. I'm not going to your dealer for this shit. I found a good complete gems 4.6L already for $1k. Plus with all the money i saved on that fuel pump i can buy all new bearings off ebay too.
p.s. i liked that ebay pump, it actually felt heavier and better contructed than the airtex i put in the truck. plus it came with the new screen, not a $10 extra.
p.s. i liked that ebay pump, it actually felt heavier and better contructed than the airtex i put in the truck. plus it came with the new screen, not a $10 extra.
$1k for your badass 4.6 donor
$450 for the cam and timing set
$400.00 in head work
$100.00 head bolts
$300.00 Master gasket set
$150.00 bearings
$50.00 to have the block cleaned, baked, and inspected
$100.00 to turn the crank
$100.00 to have the wrist pins removed and reinstalled with the 4.0 pistons
$100.00 piston rings
$100.00 push rods
You're already over $2,700 and you have not had someone set-up the bottom end, or bought freeze plugs, oil, spark plugs, wires, Right Stuff, anti-freeze, etc, etc, etc.....
If you want to really bump up the HP, you're looking at even more head work, valve springs, lots of machine shop time, intake work and/or mega-squirt, etc....
$450 for the cam and timing set
$400.00 in head work
$100.00 head bolts
$300.00 Master gasket set
$150.00 bearings
$50.00 to have the block cleaned, baked, and inspected
$100.00 to turn the crank
$100.00 to have the wrist pins removed and reinstalled with the 4.0 pistons
$100.00 piston rings
$100.00 push rods
You're already over $2,700 and you have not had someone set-up the bottom end, or bought freeze plugs, oil, spark plugs, wires, Right Stuff, anti-freeze, etc, etc, etc.....
If you want to really bump up the HP, you're looking at even more head work, valve springs, lots of machine shop time, intake work and/or mega-squirt, etc....
D Chapman said:
you forgot rod bolts. heads are already done 2k miles ago when i did head gaskets, i'm not machining a perfecting good block/crank/rods, i have a press here at work for the piston swap, and the rest of that shit i can get on ebay for like 50 bucks.
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i'm not spending 3k+ on and engine rebuild for a D1. im not going to put it back together with duct tape either. I've gone all out on rebuilds before. A 351 windsor i had completely redone, machine, new cam, new pistons, everything. waste of money in that old ford pickup. i did a quad 4 in a grand am. once again all machined with new parts, waste of money. I'm done dumping thousands into vehicles that just plain old aren't worth it.
Put those used cylinder heads on another motor, or even the same motor once removed, and let us know how that works out.
Well you are getting through to me a little. Maybe its better just to keep 4.6 stock with new head gaskets and drop it in and be done with it. or wait to do head gasket until the time comes to need them
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don't get me wrong its a good list and if i had the money and really really liked my D1 then yes thats how i would go about it and have a motor that will last 200k more miles but 200k more miles in a rover could be 20 years, i'm not going to be rolling in my D1 in 20 years. for now i want to just squeeze maybe 50k miles out of it and do it with a bit more power, the 4.0 pistons is for me because i don't like the normal. but having to heat the rods and quickly set the wrist pins on a gig that i don't have may push me towards just using 4.6 pistons and not having to remove the heads if i get a good long blockrobertf said:
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robertf said:
Because they're $7.00ea and I've never seen a Rover engine with over 100,000 miles not have at least 3 or 4 bent push rods.
excessive consumption? Hardly.
3.9, 4.0, 4.2 and 4.6 use the same cylinder bore....3.9 block is not cross bolted... a 4.6 is a stroked 4.0... if I do remember correctly the 4.6 uses the same crank and rods as the 3.5...3.5 is a smaller bore... again from memmory I may be wrong but the 4.2 is a stroked 3.9 and not crossbolted...
D Chapman said:
you must have seen all of them... I have only ever seen one that was messed up and it wasnt even bent..